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3 Answers

Fuel Options

Asked by: 1853 views Aircraft Systems

For piston engines, the typical fuel is 100LL. The FAA handbook says to use a higher grade if 100LL is not available. What is the higher grade? All I have ever been exposed to for piston engines is 100LL yet the FAA Airplane Flying Handbook mentions other types of piston fuel. Thank you for the feedback.  

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3 Answers

  1. Mark Kolber on Sep 06, 2013

    There used to be other grades available, 100/130 (green) and 115/145 (purple) among them. I think the 115/145 may still be available on special order for some WWII era high performance aircraft, but for the most part both are gone in the US. Whether some other countries without leaded fuel regulation still have them, I don’t know.

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  2. Cadu on Sep 06, 2013

    100/130 is the same of 100?

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  3. Mark Kolber on Sep 07, 2013

    Yes, what is referred to in some POH as 100 – Green (leaded fuel) is what used to be referred to as 100/130. I think at one time they used two numbers to refer to different performance aspects.

    For example, Section 1 of the 1979 Cessna 152 POH talks about

    Approved Fuel Grades (and Colors):
    100LL Grade Aviation Fuel (Blue).
    100 (Formerly 100/130) Grade Aviation Fuel (Green).

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